<!DOCTYPE html>
<style>
g {
  outline: 50px solid lightblue;
}
rect#r {
  outline: 50px solid blue;
}
</style>
<svg width="500" height="500">
  <g transform="translate(50 50)">
    <rect width="400" height="100"/>
    <rect y="300" width="400" height="100"/>
    <rect id="r" x="100" y="100" width="200" height="200" fill="green"/>
  </g>
</svg>
